KINESIOL 1Y03 Lecture Notes - Lecture 33: Temporal Bone, Brachioradialis, Mastoid Part Of The Temporal Bone

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 1Y03
• Professor: Krista Howarth

Document Summary

All muscles need to cross a joint in order to cause a movement. Origin or head: muscle end attached to more stationary of 2 bones. More proximal, closer to axial skeleton originates on the axial skeleton often. Insertion: muscle end attached to bone with greatest movement. A skeletal muscle attached to two bones has to cross a joint. Biceps cause elbow flexion, attaches at scapula and attaches on the forearm on the radius. Belly: largest portion of the muscle between origin and insertion. Cord-like structure attached to the end of muscle. Muscle turns into tendon when meeting bone, collagen fibers rearranging: aponeurosis a very broad tendon, sheet-like, not cordlike, muscle flattened attaching over a larger surface area. Agonist muscle than, when it contracts, causes an action. Antagonist a muscle working in opposition to agonist. Need opposing muscle groups because muscles contract and can only be activated. Opposing muscle contracts to do the opposite movement of agonist.